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SAT Math Videos 171 videos
SAT Math 1.1 Algebra and Functions. Find an algebraic equation to correspond with the data.
SAT Math 1.1 Geometry and Measurement. What is the circumference of the circle?
SAT Math 1.1 Numbers and Operations. How many combinations of beverage and cereal can be made?
SAT Math 5.1 Geometry and Measurement 219 Views
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Description:
SAT Math 5.1 Geometry and Measurement
Transcript
- 00:02
Here’s your shmoop du jour, brought to you by 45 degrees.
- 00:06
If a right angle is 90 degrees, we guess this angle is only half right.
- 00:12
What angle is made when the hands of a clock are at 2:30?
- 00:15
Here are the potential answers...
- 00:18
Alright, where to begin….
Full Transcript
- 00:20
so… a “clock” is this type of antiquated time-telling device used in the era before cell phones…
- 00:27
All right, so we’ve got our minute hand, which is obviously pointing to the…minute.
- 00:31
The hour hand, however, is a bit trickier.
- 00:34
Rather than making a big jump suddenly from the 2 to the 3 at some point,
- 00:38
it meanders slowly during the hour...
- 00:40
But we’re dealing with 2:30, which should be easy –
- 00:43
we’re exactly halfway between 2 and 3 o’clock, right here.
- 00:48
We know that a circle has 360 total degrees…
- 00:51
…so the angle between any two numbers on a clock face must be one-twelfth of that…or 30 degrees.
- 00:58
Looking at our hands…not those, focus on the problem, please…
- 01:02
…we can see that we are looking for an angle equivalent to 3 and a half hours.
- 01:07
At 3.5 times 30 or 105… so our solution is choice B.
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